<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>My first three.js app</title>
    <style>
      body { margin: 0; }
    </style>
  </head>
  <body>
    <script src="js/three.js"></script>
    <script>
      // Our Javascript will go here.
      const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
    const renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

    const geometry = new THREE.BoxGeometry();
    const material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
    const cube = new THREE.Mesh( geometry, material );
    scene.add( cube );
    camera.position.z = 5;

    function animate() {
        requestAnimationFrame( animate );
        renderer.render( scene, camera );

        cube.rotation.x += 0.01;
        cube.rotation.y += 0.01;
    }
    animate();
    </script>
  </body>
</html>